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The Tor Browser
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TimelineCollection.h (2213B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef mozilla_TimelineCollection_h
      8 #define mozilla_TimelineCollection_h
      9 
     10 #include "mozilla/LinkedList.h"
     11 #include "mozilla/Maybe.h"
     12 #include "mozilla/PseudoStyleType.h"
     13 #include "mozilla/RefPtr.h"
     14 #include "nsAtomHashKeys.h"
     15 #include "nsTHashMap.h"
     16 
     17 class nsAtom;
     18 
     19 namespace mozilla {
     20 namespace dom {
     21 class Element;
     22 }
     23 
     24 // The collection of ScrollTimeline or ViewTimeline. We use the template class
     25 // to share the implementation for these two timeline types.
     26 template <class TimelineType>
     27 class TimelineCollection final
     28    : public LinkedListElement<TimelineCollection<TimelineType>> {
     29 public:
     30  using SelfType = TimelineCollection<TimelineType>;
     31  using TimelineMap = nsTHashMap<RefPtr<nsAtom>, RefPtr<TimelineType>>;
     32 
     33  TimelineCollection(dom::Element& aElement,
     34                     const PseudoStyleRequest& aPseudoRequest)
     35      : mElement(aElement), mPseudo(aPseudoRequest) {
     36    MOZ_COUNT_CTOR(TimelineCollection);
     37  }
     38 
     39  ~TimelineCollection();
     40 
     41  already_AddRefed<TimelineType> Lookup(nsAtom* aName) const {
     42    return mTimelines.Get(aName).forget();
     43  }
     44 
     45  already_AddRefed<TimelineType> Extract(nsAtom* aName) {
     46    Maybe<RefPtr<TimelineType>> timeline = mTimelines.Extract(aName);
     47    return timeline ? timeline->forget() : nullptr;
     48  }
     49 
     50  void Swap(TimelineMap& aValue) { mTimelines.SwapElements(aValue); }
     51 
     52  void Destroy();
     53 
     54  // Get the collection of timelines for the given |aElement| and or create it
     55  // if it does not already exist.
     56  static TimelineCollection* Get(const dom::Element* aElement,
     57                                 const PseudoStyleRequest& aPseudoRequest);
     58  const TimelineMap& Timelines() const { return mTimelines; }
     59 
     60 private:
     61  // The element. Weak reference is fine since it owns us.
     62  dom::Element& mElement;
     63  const PseudoStyleRequest mPseudo;
     64 
     65  TimelineMap mTimelines;
     66 };
     67 
     68 }  // namespace mozilla
     69 
     70 #endif  // mozilla_TimelineCollection_h